Spark plug scraper



Jan. 2l, 1936. W, SCOTT ET AL T 2,028,170

A SPARK PLUG SGRAPER' Filed July 24, y1954:

Y ATTORNEY Patentedl Jan. 2l, 1936Y PATENT oFFlcE 2,028,170 SPARK PLUG SCRAPER Walter I. Scott and Lillian H. Foster, New Orleans, La.

Application July 24, 1934, Serial N0. 736,748 1 Claim. (Cl. 15-104.01)

This invention relates to a scraper especially adapted for removing carbon and like foreign matter from a spark plug which tends to interfere with the efficiency of a spark plug after a period of use in an primary object the provision of a tool which may be stamped or otherwise made at a low cost and is provided with prong portions Vhaving cutting edges to be inserted in the body of a spark plug labout the insulator to remove carbon found between the body and the insulator by a simple turning movement of said tool in opposite directions. Y

With these and other objects in view this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of the invention, l

reference is to be had to the following descriptionand accompanying drawing, in which Figure 1 is a vertical sectional View illustrating a spark plug with a scraper applied thereto and constructed in accordance with our invention.'

Figure 2 is a plan View illustrating the scraper.

Figure 3 is an edge View illustrating the same.

Figure 4 is a sectional View taken on the line 4 4 of Figure 2. V K

Referring in detail to the drawing, the numeral l indicates a finger piece preferably constructed of metal of a suitable gage which is cut away, as shown at 2, to form spaced portions 3 terminating into prongs 4. Opposite edges of the prongs are beveled to form cutting edges 5 which g.

one another at the of the prongs. The

cutting edges merge with free ends or pointed ends opposed cutting edges 5 of the prongs are disposed at an inclination or converge towards the cutaway portion 2 of the nger piece so as to conform to the contour of one end of an insulator 6 of a spark plug l, as shown in Figure l. In use 5 the prongs are inserted between the tapered end of the insulator 6 and the body portion 8 of the spark plug and by turning the nger piece in opposite directions the cutting edges 5 will remove carbon adhered to the insulator and the inner wall of the body 8.

The portions 3 of the finger piece which merge into the prongs 4 are offset, as shown at 9. The oisets 9 permit the prongs to pass under the negative electrode of the spark plug or that electrode carried by the body 8 of said spark plug. The prongs being able to pass under the electrode referred to permits the entire space between the insulator and the body of the plug to be freed or cleaned of carbon.

The nger tion of a key ring or like device.

-Having described the invention, we claim:

A scraper comprising a plate providing a ringer piece, parallel spaced shanks integral with the plate and formed to provide recesses offset from the plane of the Shanks and in the same direction to receive a grounded electrode of a spark plug, and ilat spaced prongs integral with and piece I is apertured for the recepextending in the same direction as the shanks with the outer edges thereof substantially parallel and each tapering towards its free end and having inner and outer cutting edges, said Shanks and prongs defining a space to receive an insulator of the spark plug.

WALTER I. SCOTI.

LILLIAN H. FOSTER. 

